ENGINE / TRANSMISSION
Piston Failure - Scoring
• Lack of lubrication
• Dirt entering engine through cracks in air filter or ducts
• Engine oil dirty or contaminated
Excessive Smoke and Carbon Buildup
• Excessive piston-to-cylinder clearance
• Worn rings, piston, or cylinder
• Worn valves, guides or seals
• Restricted crankcase vent
• Air filter dirty or contaminated
• Engine oil level too high
Low Compression
• Cylinder head gasket leak
• No valve clearance or incorrectly adjusted
• Cylinder or piston worn
• Piston rings worn, leaking, broken, or sticking
• Bent valve or stuck valve
• Valve spring broken or weak
• Valve not seating properly (bent or carbon accumulated
on valve area)
• Rocker arm sticking
Backfiring
• ETC or speed limiter system malfunction
• Fouled spark plug or incorrect plug or plug gap
• Carburetion faulty - lean condition
• Intake / Exhaust system air leaks
• Spark plug cap cracked / broken
• Ignition coil faulty
• Ignition or kill switch circuit faulty
• Ignition timing incorrect
• Sheared flywheel key
• Poor connections in ignition system wiring
• Ignition system wiring wet
• Cam lobe worn or valve sticking
• Lean condition
Transmission
Gear Will Not Engage
• Shift arm indexed incorrectly (hits bracket)
• Shift arm slipping on spline
• CVT Belt broken
• Internal trans gear damage
• Shift fork broken or bent
• Shift shaft broken
Pops Out Of Gear
• Shift arm indexed incorrectly (hits bracket before full
engagement)
• Shift arm slipping on spline
• Detent spring or ball missing, worn, or broken
• Gear engagement dogs worn (rounded) or broken
• Shift fork bent
Noise
• Incorrect transmission lubricant
• Lubricant level too low
• Lubricant level too high
• Bearings worn or damaged
• Gears worn or damaged
• CVT problem (belt)
• Final drive (chain or sprockets) worn or damaged
4.25
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